Keyphrases
- document retrieval
- language model
- document collections
- information retrieval
- retrieval model
- passage retrieval
- relevance feedback
- relevant documents
- ranking functions
- text retrieval
- document indexing
- document ranking
- spreading activation
- data structure
- semantic mapping
- learning to rank
- digital libraries
- retrieval effectiveness
- cross language
- pseudo relevance feedback
- inverted index
- question answering systems
- retrieved documents
- web documents
- data sets
- information extraction
- information retrieval systems